Weighing scale



Dec. 17, 1929. A. VAN DuYN 1,740,320

WEIGHING' SCALE Filed July 11. 192'? 2 Sheets-Sheet 1 20 1 I y IIIIIII I l @maar Dec. 17, 1929. .A. VAN DuYN 1,740,320

wEfGHING SCALE AFiled Ju1y 11. 1927 2 shuts-sheet 2 Patented Dec. 17, 1929 ITEDS TATE Sv' PATEN T-iOFICE ADRIANUSWAN lmm,` oF RoT'rERnAmNETEnLANDs,1AssrGNoR 'ro nAAnLoozE VENNooTscHAP MALaLrslcrigufrIJf-Tom 1VERAaRbIG`INQVAN sNrqMAcHIJNEfs vor.- GENS VANlv ,BnBnLs-PPATENTENvANANDERE WERKTUIGEN, or' ROTTERDAM,

THE NETHERLANDS, .Ay LIMITED LIABILITY COMPIXNY O1?1 THE WEIGHINQ- scnLE Application led July 11, 1927, Serial 110.204,74, and in Germany March 2,1926.

edge vof .which isprovidedwith an arcuate lguideway, or jsome. otherV suitable. guide suri.faceextending, along.. a roller 8f.. The roller S8 ,is supported iniknifefedges .secured to a plate'9 screwed .tothe'same Thisplatehasa cut-outportion-10 rwhich, as shown .in Figs. 44.I)and 6,.is.closedfat the leftfhand l side *by bevelededge 11. -.T he r`beveled.edgell engages thervertical plate 12 whichL projectsl through ,the A cut-ou tportion means of the bars and rods leading tothe.10;.'ACljCQIlbbOthendsoitliebveleddg indicator casing would, however, give rise to disturbing friction.

In order to overcome this difficulty it had been proposed to use a double bridge or beam system, which, however, renders weighing mechanism more complicated. In these def Vices the parallel guidance in the indicator casing may be dispensed with, but the casing for the weighing mechanism must be made very high, and this increases the manuactur.` ing costs. v

In order to avoid these diiiiculties and to attain simplification of the parallel guidance, even in. the so-called side scales, the pan or 11-` the platefjtl is ,offset ,laterally and on. these .fgofi'set portions it is .shaped to. form; the knife .edges 13 extending in Y, alinementwiththe edge llzand engaging upwardly projecting ears vonl the plate 1,4, ,one at eachside ofthe .Lplate 9...Ihisiplate-11 iscut out on top to form the spaced earshland.toadmittliepifset part of `the plate 9and it is secured by .screws againsttheplate 12. .Bothfplates are Iixedly I. connected. vvith.the..part .1,5 .of the zsubdrame of thescale... Thefupperqedge otthecut-out 'y po,r :t io1`i 'they plate. 14,l isbeveled I.to form a yknifeedgecontact withV the plate 9. p

f U pon., the ,subeframe 16'; offthegscalel. the

pans are guided according to the present iii-...bracket 1751s rotatably mounted,,saidfbracket vention directly or indirectly along a rotat.- able member which is located between the pans in those scales in which more than one pan is used. The rotatable member may then be supported on knife edges. One embodiment of the invention is illustrated in the drawings, in which:

Fig. 1 is a front elevation of a scale with device according to this invention;

Fig. 2 shows the device on a larger scale; Fig. 3 is a sideelevation; Fig. 4 is a top plan view of Fig. 2;

supporting.,theindicator .plate `1 .8.an`d.,the pointer 3 with its pendulum'weight 20.

The connecting rod for connecting thepen- .dulunnweightr with themechanism of the scale is indicated at 23. 'i i .i .The roller 8 may.be,maintained in fitsbear- Vings byL means oiiay flexible strap 21 placed ...about the: same -andthe ends thereof are se- ,cured tothe arms 5., 4Inorder to render'this .fsup.port`a..yielding oneone end of the strap g Y. may be securedjoaspring 22, Fig. 2.4 .The .strap21islocated ina groove 24, Fig. v3, so

Fig. 5 is a fragmentary view of the knifehftQIZOllimdth@ Parts 7 are in .direct 40 edge bearing for the rotatable guide; and

Fig. 6 is a section on line 6 6 of Fig. 5.

The pans 1 of the scale illustrated in Fig.` i

1 are supported in the customary way on the bridge or beam 2. Each pan carrier 4 is connected with one end of a guide arm 5v which extends at first horizontally and then upwardly into the upper portion of the vertical scale tree or indicator casing.

The upper end of each arm 5 is provided t with an adjustable part 7, Fig. 2, the innerA bers connected with said pans, a rotatable element interposed between said upright members for guiding said pans for parallel movement, a air of bearing plates having adjacent sur aces thereof disposed in a common plane, and knife edge bearings connected with said rotatable element and engaging said surfaces to hold said rotatable element against lateral movement in opposite directions.

3. A weighing scale comprising a scale beam, a pair of pans pivotally mounted on said scale beam adjacent opposite ends thereof, upright members connected with said pans, a rotatable element interposed between said upright members for guiding said pans for parallel movement, and a flexible member disposed about said rotatable element and connected to said uprights to hold said rotatable element from displacement.

4. A weighing scale comprising a scale beam, a pair vof pans pivotally mounted on said scale beam at opposite ends thereof, a pair of upright members connected with said pans, a rotatable element interposed between said upright members for guiding said pans for parallel movement, a knife edge bearing for said rotatable element, a flexible member disposed about said rotatable member and connected with said upright members for retaining said rotatable element against displacement, and a spring tension device for said flexible member.

5. A weighing scale comprising a scale beam, a pair of pans mounted on said scale beam, upright members connected with said pans, a rotatable element interposed between said upright members for guiding said pans for parallel movement, said rotatable element having a peripheral groove therein, and a flexible member disposed in said groove and connected with said upright members for retaining said rotatable element against displacement.

6. A weighing scale comprising a scale beam, a pair of pans mounted on said scale beam, upright members connected with said pans, a rotatable element interposed between said upright members for guiding said pans for parallel movement, said rotatable element having a plate secured thereto provided with an opening, a bearing plate extending through said opening, said first-named plate having a beveled knife edge at one side of said opening for engaging said bearing plate, a second bearing plate having the surface thereof co-planar with said first-named bearing plate, and additional knife edge bearings on said first-named bearing plate engaging said copla-nar surface of said second-named bearing plate. y

7 In a weighing scale, a scale beam, a pair of pans pivotally mounted on said scale beam, arms extending inwardly from said plates, upright members secured to the inner ends of l J une A. D. 1927.

ADRIANUS VAN DUYN. 

